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Unformatted text preview: the other branches unchanged. 3. Voltage drops across branches in parallel are the same . 4. Overall resistance decreases with the number of branches. 2 Parallel Circuits and Overloading Our electrical lines supply and maintain 120V. When more and more appliances (such as lamps and refrigerators) are hooked in parallel to an outlet (by a power strip): The same 120 volts is across each appliance. The Equivalent Resistance: R eq gets lower with the addition of more appliances. The total current drawn increases: I T = V T R eq The power drawn increases: P = V T I T = V 2 T /R eq If the current drawn is too high, we say the line is overloaded ; the results can be overheating, res, damage to appliances. A Fuse : device that melts at a current lower than that which overload the line being pro-tected. (ex: Use an 8 amp fuse to protect against a damaging 10 amps.) The fuse must be hooked in series to protect the line. Why? 3...
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